2017-07-19 00:57:26 +02:00
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## How big of a file can I transfer with Firefox Send?
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There is a 2GB file size limit built in to Send, however, in practice you may
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be unable to send files that large. Send encrypts and decrypts the files in
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the browser which is great for security but will tax your system resources. In
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particular you can expect to see your memory usage go up by at least the size
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of the file when the transfer is processing. You can see [the results of some
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testing](https://github.com/mozilla/send/issues/170#issuecomment-314107793).
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For the most reliable operation on common computers, it’s probably best to stay
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under a few hundred megabytes.
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## Why is my browser not supported?
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We’re using the [Web Cryptography JavaScript API with the AES-GCM
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algorithm](https://www.w3.org/TR/WebCryptoAPI/#aes-gcm) for our encryption.
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Many browsers support this standard and should work fine, but some have not
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implemented it yet (mobile browsers lag behind on this, in
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particular).
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2017-08-03 08:37:55 +02:00
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## Why does Firefox Send require JavaScript?
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2017-08-03 18:26:04 +02:00
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Firefox Send uses JavaScript to:
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- Encrypt and decrypt files locally on the client instead of the server.
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- Render the user interface.
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- Manage translations on the website into [various different languages](https://github.com/mozilla/send#localization).
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- Collect data to help us improve Send in accordance with our [Terms & Privacy](https://send.firefox.com/legal).
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2017-08-03 08:37:55 +02:00
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Since Send is an open source project, you can see all of the cool ways we use JavaScript by [examining our code](https://github.com/mozilla/send/).
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2017-07-19 00:57:26 +02:00
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## How long are files available for?
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Files are available to be downloaded for 24 hours, after which they are removed
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2018-04-08 00:21:55 +02:00
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from the server. They are also removed immediately once the download limit is reached.
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2017-07-19 00:57:26 +02:00
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## Can a file be downloaded more than once?
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2018-04-08 00:21:55 +02:00
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Yes, once a file is submitted to Send you can select the download limit.
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2017-07-19 00:57:26 +02:00
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*Disclaimer: Send is an experiment and under active development. The answers
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here may change as we get feedback from you and the project matures.*
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